Stay-bolt structure



E. I. DODDS. STAY BOLT STRUCTURE.

Patented Jan. 17, 1922.

STATES PATENT QFFICE.

ETEAN L. D'GDDS, OF CENTRAL VALLEY, NEW YGRK, ASSIGNOR T0 FLANNERY BOLT GGMPANY, @F FITTSBURGH, PENNSYLVANIA.

sear-hour STRUCTURE.

Licence.

Specification of Letters Iiatent.

Patented Jan. 17, 1922.

T 0 all whom it may concern:

Be it known that I, ETHAN I. Donne, a citizen of the United States, and alresident of Central Valley, in the county of Orange and State oilfiew York have invented certain .new'and useful Improvements in Stay- Bolt Structures; and I do hereby declare the following to be a full, clear, and exact description of the invention,-such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in stay bolt structures the object being to provide simple, comparatively inexpensive and easily assembled means for connecting the stay bolt to the outer sheet of the boiler, the construction being such that the stay bolt will be capable of universal movement on saidconnecting device, and it consists in the parts and combination of parts as will be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in longitudinal. section through the head or outer end of a stay bolt and its su port; Figure 2 is a similar view at rig t angles thereto, the cap being omitted, and Figures 3 and. 4- are views similar to Figures 1 and 2 of a solid cap permanently closing the bolt opening and covering and concealing the bolt, and Figure 5 is a view in cross section of the cap shown in. Figs. 3 and 4.

5 represents the outer sheet of a boiler provided with a bolt opening 63 therein. This opening may be of any shape, and may be the threaded opening from which' the sleeve of the ordinary Tate stay bolt has been removed. The shape of the opening is immaterial as the securin or supporting devices are located on an supported by the outer surface of the outer sheet instead of by the walls of the o enings. I

7 represents the bot provided at its outer end with an eye 8 for the passage of the supporting" bar or bridge 9 the free ends of which are supported on the outer surface of the sheet 5. This bridge may be straight, but I prefer to bow it as shown so as to pro= vide a recessed seat for the cross bar 10 of the eye of the bolt 7 The said cross bar '10 of the eye of the bolt is preferably elliptical incross section as shown in Figure 1, and the bridge convex on its upper face in cross section as shown in Figure 2 so as to permit the bolt to have a. universal swinging movement on the bridge, and the eye 8 of the bolt is of greater depth than the bridge so that the bolt may move longitudinally thereon under collapsing stresses of the boiler sheets.

Secured to the outer surface of the sheet 5. preferably by welding as at 11, is the cylinder sleeve 12, the internal diameter of which is approximately the length of the bridge 9 so as to prevent any undue endwise movement of the latter, or movement sufficient to permit either end of the bridge to drop into the bolt hole 6. This sleeve therefore holds the bridge in place, and is provided with a cap 13 which not only closes the sleeve but the cap thereof forms an abutment for the bolt in the event of undue collapsing stresses on the boiler sheets which would tend to move the bolt outwardly.

The sleeve is preferably oounterbored and threaded as shown to receive the cap and is provided with a seat 14 on which theg'liange of the cap rests to form a steam tight joint.

With this construction there is no coun terboring, threading or curving of the wall of the bolt opening in the boiler sheet to receive the bolt bearing member, hence the costof construction and assembling is greatly cheapened and simplified.

In applying the bolt, the brid e is inserted 1n the eye of the bolt and tie latter passed through the bolt hole 6 and its inner end entered in the hole in the inner sheet (not shown) and screwed olf'driven there in the usual and well known manner, so that the bolt will be solidly seated on the bridge. After or before the bolt has been secured as above explained the sleeve 12 is ap lied and secured to the outer sheet and the sleeve is then closed by the cap which may be re moved at any time to permit of the inspection of the bolt.

The construction shown in Figures 3 and i is substantially identical with that shown in Figures 1 nd 2, except that the cover 13" is made soli and without a removable cap, and is permanently secured to .the sheet.

In the construction shown in Figures 1 and 2 the Sleeve 12 is recessed as at 15 at diametrically opposite points to receive the ends of the bridge 9 whereby the latter will be prevented from turning.

In the construction shown in Figures 8,

- I claim as new and desire to secure by Let- 4 and 5 the cover 13 is offset as clearly shown at 15 Figures 3 and 5 to receive the ends of the cross bar or bridge 9. In both forms a wrench or other tool can be applied to the sleeve 12 or cover 13 for turning the uolt to secure it to the inner sheetl Having fully-described, my invention what ters-Patent, is

1. In a staybolt construction, the combination with a boiler sheet having a bolt opening therethrough a bridge mounted at its ends on the outer surface of said sheet, a

bolt having an eye through which said bridge the bridge passes and a cover detachably secured to the sleeve.

. 3. In a sta bolt construction, the combination of a boiler sheet having a bolt opening therein, a curved or bowed bridge spanning said opening and supported at its ends on the outer face of the sheet, a sleeve secured to the sheet around the said opening, a bolt having an eye through which the bridge passes and a detachable cover for said sleeve.

4. In staybolt construction, the combination of a boiler sheet having a bolt opening therethrough, a bridge mounted at its ends on said sheet, a bolt having an eye through which said bridge passes, the bolt being mounted on the bridge for universal movement and a cover for the bolt opening, the said cover being provided in inner face at opposite points with recesses to receive the two ends of the bridge.

In testimony whereof I have signed this specification in the presence of a subscribing witness.

' ETHAN I. DODDS. Witness:

EDWIN S. RYon. 

